Ask HN: I have 18 weeks to learn whatever I want, do you have any suggestions?

Hello HN, to give you a bit more information, I'm 17 years old and present taking a second year computer course in which I can decide what I would like to learn. I presently have dabbled in Pascal, C++, and Ruby. I have some basic knowledge of data structures, and well, just written some programs(probably very basic to you).

I am very interested in trying to learn more about Ruby/Ruby On Rail/and C++. If you know of any small tutorials or site that teaches anything, I would appreciate any information that you can share! (Whatever you share doesn't have to be a full 18 weeks worth, obviously I am going to be doing a lot of things.

Thanks in advance for your replies.

edit: Any tutorial sites, books that are great for learning, source that is great to read, or project guides that I could create to get some hands on learning. All is appreciated.